Throne provided the voice of "the Keeper" in the Star Trek's first pilot episode, "The Cage" (1964). Not broadcast in its original form for many years, most of the episode was included within the two-parter "The Menagerie" (1966).[4] As Throne was cast in another role in "The Menagerie", Commodore José I. Mendez, the Keeper's voice was electronically altered in pitch.[5] On Star Trek: The Next Generation, Throne played Pardek, a Romulan senator, in the two-part episode "Unification". In 2004, he appeared in the second episode of the New Voyages, entitled "In Harm's Way".[6]

He played the villain "False Face" in the ABC Batman (1966) series. The character, who used a variety of disguises to effect his nefarious schemes, wore a semitransparent mask when not in the middle of his crimes. The mask rendered Throne's real face unrecognizable on screen. Playing off this effect, but against Throne's wishes, the show's producers wrote the onscreen credit as "? as False Face", denying Throne his screen credit. However, at the end credits of "Holy Rat Race", Throne's full name was credited. Later, he appeared in animation as the voice of Two-Face's superego "the Judge" on The New Batman Adventures (1998), and as the voice of Fingers the Gorilla on the Batman Beyond episode "Speak No Evil" (2000).[7]

In the 1990s in the American television series Babylon 5, Throne played Prime Minister Malachi, a high official of the Centauri government in the The Coming of Shadows. (The surprising character's name was not revealed until a later episode.) The Prime Minister's assassination ensured the Centauri would carry out a costly war, one with tragic repercussions, that drove one of the many plot lines in the five year story of the TV series.[citation needed]

Throne lived in Southern California, and he did much local theater work there. He was a member of the Theater West company in Hollywood. He also won critical acclaim for several performances with the Fountain Theatre in Los Angeles. Much earlier in his career, he had appeared briefly on Broadway (as "Mal Thorne") in Reginald Lawrence's Legend of Lizzie, and other plays. He had a small role in the 2002 film Catch Me if You Can.[2]

Throne died of lung cancer at his Brentwood, California home on March 13, 2013 at the age of 84. In addition to his widow and his sons by his first marriage to Judith Merians, he was survived by two step-children, two grandchildren, and a sister.[2]